| Segment and Significant Customer Information |
| | | Segment and Significant Customer Information |
We assess our business on a regional basis due to the impact on our financial performance of the differing characteristics of these regions, particularly with respect to competition, regulation and other factors impacting supply and demand. At December 31, 2013, our reportable segments were West (including geothermal), Texas, North (including Canada) and Southeast. We continue to evaluate the optimal manner in which we assess our performance including our segments and future changes may result. Commodity Margin is a key operational measure reviewed by our chief operating decision maker to assess the performance of our segments. The tables below show our financial data for our segments for the periods indicated (in millions). | | | | | | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, 2013 | | West | | Texas | | North | | Southeast | | Consolidation and Elimination | | Total | Revenues from external customers | $ | 1,937 |
| | $ | 2,347 |
| | $ | 1,356 |
| | $ | 661 |
| | $ | — |
| | $ | 6,301 |
| Intersegment revenues | 5 |
| | (4 | ) | | 33 |
| | 189 |
| | (223 | ) | | — |
| Total operating revenues | $ | 1,942 |
| | $ | 2,343 |
| | $ | 1,389 |
| | $ | 850 |
| | $ | (223 | ) | | $ | 6,301 |
| Commodity Margin | $ | 1,020 |
| | $ | 632 |
| | $ | 712 |
| | $ | 204 |
| | $ | — |
| | $ | 2,568 |
| Add: Unrealized mark-to-market commodity activity, net and other(1) | (50 | ) | | 51 |
| | 5 |
| | 22 |
| | (31 | ) | | (3 | ) | Less: | | | | | | | | | | | | Plant operating expense | 365 |
| | 269 |
| | 172 |
| | 120 |
| | (31 | ) | | 895 |
| Depreciation and amortization expense | 243 |
| | 165 |
| | 130 |
| | 73 |
| | (2 | ) | | 609 |
| Sales, general and other administrative expense | 37 |
| | 56 |
| | 21 |
| | 21 |
| | 1 |
| | 136 |
| Other operating expenses | 45 |
| | 3 |
| | 29 |
| | 4 |
| | — |
| | 81 |
| (Income) from unconsolidated investments in power plants | — |
| | — |
| | (30 | ) | | — |
| | — |
| | (30 | ) | Income from operations | 280 |
| | 190 |
| | 395 |
| | 8 |
| | 1 |
| | 874 |
| Interest expense, net of interest income | | | | | | | | | | | 690 |
| Debt extinguishment costs and other (income) expense, net | | | | | | | | | | | 164 |
| Income before income taxes | | | | | | | | | | | $ | 20 |
|
| | | | | | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, 2012 | | West | | Texas | | North | | Southeast | | Consolidation and Elimination | | Total | Revenues from external customers | $ | 1,668 |
| | $ | 1,857 |
| | $ | 1,280 |
| | $ | 673 |
| | $ | — |
| | $ | 5,478 |
| Intersegment revenues | 10 |
| | 61 |
| | 14 |
| | 80 |
| | (165 | ) | | — |
| Total operating revenues | $ | 1,678 |
| | $ | 1,918 |
| | $ | 1,294 |
| | $ | 753 |
| | $ | (165 | ) | | $ | 5,478 |
| Commodity Margin(2)(3) | $ | 994 |
| | $ | 570 |
| | $ | 729 |
| | $ | 245 |
| | $ | — |
| | $ | 2,538 |
| Add: Unrealized mark-to-market commodity activity, net and other(1) | (93 | ) | | 87 |
| | (14 | ) | | (33 | ) | | (31 | ) | | (84 | ) | Less: | | | | | | | | | | | | Plant operating expense | 368 |
| | 247 |
| | 206 |
| | 131 |
| | (30 | ) | | 922 |
| Depreciation and amortization expense | 203 |
| | 142 |
| | 134 |
| | 85 |
| | (2 | ) | | 562 |
| Sales, general and other administrative expense | 36 |
| | 47 |
| | 28 |
| | 29 |
| | — |
| | 140 |
| Other operating expenses | 42 |
| | 5 |
| | 29 |
| | 5 |
| | (3 | ) | | 78 |
| (Gain) on sale of assets, net | — |
| | — |
| | (7 | ) | | (215 | ) | | — |
| | (222 | ) | (Income) from unconsolidated investments in power plants | — |
| | — |
| | (28 | ) | | — |
| | — |
| | (28 | ) | Income from operations | 252 |
| | 216 |
| | 353 |
| | 177 |
| | 4 |
| | 1,002 |
| Interest expense, net of interest income | | | | | | | | | | | 725 |
| Loss on interest rate derivatives | | | | | | | | | | | 14 |
| Debt extinguishment costs and other (income) expense, net | | | | | | | | | | | 45 |
| Income before income taxes | | | | | | | | | | | $ | 218 |
|
| | | | | | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, 2011 | | West | | Texas | | North | | Southeast | | Consolidation and Elimination | | Total | Revenues from external customers | $ | 2,372 |
| | $ | 2,306 |
| | $ | 1,336 |
| | $ | 786 |
| | $ | — |
| | $ | 6,800 |
| Intersegment revenues | 12 |
| | 23 |
| | 7 |
| | 135 |
| | (177 | ) | | — |
| Total operating revenues | $ | 2,384 |
| | $ | 2,329 |
| | $ | 1,343 |
| | $ | 921 |
| | $ | (177 | ) | | $ | 6,800 |
| Commodity Margin(2)(3) | $ | 1,061 |
| | $ | 469 |
| | $ | 704 |
| | $ | 240 |
| | $ | — |
| | $ | 2,474 |
| Add: Unrealized mark-to-market commodity activity, net and other(1) | 113 |
| | (102 | ) | | (13 | ) | | 1 |
| | (32 | ) | | (33 | ) | Less: | | | | | | | | | | | | Plant operating expense | 380 |
| | 235 |
| | 177 |
| | 141 |
| | (29 | ) | | 904 |
| Depreciation and amortization expense | 192 |
| | 135 |
| | 138 |
| | 90 |
| | (5 | ) | | 550 |
| Sales, general and other administrative expense | 43 |
| | 43 |
| | 24 |
| | 22 |
| | (1 | ) | | 131 |
| Other operating expenses | 41 |
| | 3 |
| | 30 |
| | 5 |
| | (2 | ) | | 77 |
| (Income) from unconsolidated investments in power plants | — |
| | — |
| | (21 | ) | | — |
| | — |
| | (21 | ) | Income (loss) from operations | 518 |
| | (49 | ) | | 343 |
| | (17 | ) | | 5 |
| | 800 |
| Interest expense, net of interest income | | | | | | | | | | | 751 |
| Loss on interest rate derivatives | | | | | | | | | | | 145 |
| Debt extinguishment costs and other (income) expense, net | | | | | | | | | | | 115 |
| Loss before income taxes | | | | | | | | | | | $ | (211 | ) |
__________ | | (1) | Includes $6 million, $1 million and $12 million of lease levelization and $14 million, $14 million and $8 million of amortization expense for the years ended December 31, 2013, 2012 and 2011, respectively. |
| | (2) | Our North segment includes Commodity Margin of $73 million and $70 million for the years ended December 31, 2012 and 2011, respectively, related to Riverside Energy Center, LLC, which was sold in December 2012. |
| | (3) | Our Southeast segment includes Commodity Margin of $52 million and $51 million for the years ended December 31, 2012 and 2011, respectively, related to Broad River, which was sold in December 2012. |
Significant Customers For the year ended December 31, 2013, we had two significant customers that individually accounted for more than 10% of our annual consolidated revenues, PJM Settlement, Inc. and PG&E. For the years ended December 31, 2012 and 2011, we only had one significant customer that individually accounted for more than 10% of our annual consolidated revenues, PJM Settlement, Inc. Our revenues from PJM Settlement, Inc. for the years ended December 31, 2013, 2012 and 2011 were approximately $820 million, $713 million and $742 million, respectively, and were attributed to our North segment. Our revenues from PG&E were approximately $694 million for the year ended December 31, 2013 and were attributed to our West segment. As of December 31, 2013 and 2012, our receivables from PJM Settlement, Inc. were approximately $26 million and $37 million, respectively. As of December 31, 2013, our receivables from PG&E were approximately $83 million. |